While the video filter configuration delivers WYSIWYG
regarding all lumina and chromina values, it does not work in WYSIWYG mode
regarding the video size. When using for example the bitmap keying filter,
the exact position of the keyed bitmap might differ from the final output.
Furthermore, filter preview for targets will not necessarilly be WYSIWYG,
especially when the source and target have different frame or pixel aspect
ratios. Also, filters with temporal dependencies may not preview correctly.
regarding all lumina and chromina values, it does not work in WYSIWYG mode
regarding the video size. When using for example the bitmap keying filter,
the exact position of the keyed bitmap might differ from the final output.
Furthermore, filter preview for targets will not necessarilly be WYSIWYG,
especially when the source and target have different frame or pixel aspect
ratios. Also, filters with temporal dependencies may not preview correctly.